Answer:
20 fluid ounce of tomato paste
Step-by-step explanation:
Given parameters:
 Recipe for the sauce;
          Fluid ounces of water  :  Fluid ounces of tomato paste
                            3: 4
 Number of fluid ounces of tomato sauce  = 35
Unknown:
Fluid ounces of tomato paste needed  = ?
Solution:
 Total ratio  = 3 + 4  = 7
Fluid ounces of tomato paste  = [tex]\frac{fraction of fluid ounces of tomato paste}{total ratio} x total fluid of tomato sauce[/tex] Â
Fluid ounces of tomato paste  = [tex]\frac{4}{7}[/tex] x 35  = 20
It will take 20 fluid ounce of tomato paste to make the sauce.
